They are words Tory leader Iain Duncan Smith will carefully file away in the hope of being able to beat Tony Blair over the head with them in five months.

During an otherwise routine question time, the prime minister suddenly declared he would have got the problem of London's street crime under control "by the end of September."

Duncan Smith demanded health pledge

His response - which ranks alongside his famous surprise promise during the last parliament to outlaw fox hunting - appeared to take everybody by surprise.

Particularly as, at the same time, he was refusing point blank to pledge that his massive investment in the NHS would result in European levels of health care by the time of the next election.

Best policy

There's nothing unusual about a prime minister carefully avoiding any hostages to fortune.

Indeed that is usually the best policy by far.

So that only made Tony Blair's unambiguous pledge on street crime - which is soaring to record levels in the capital - even more extraordinary.

Pledge came as a surprise

It may well be that there is some initiative up the prime minister's sleeve to stop the rot.

Finally getting to grips with the problem of teenage thugs relieving people of their mobile phones, with menaces, leaps to mind.

Effectively tackling that epidemic would have a major impact on street crime over night.

See you in September

But even if there is some huge and so far unforeseen initiative about to be unleashed on London's petty criminals, most seasoned politicians would still rather pierce their eyeballs than commit themselves to a timetable.